F. Abel, N. Henze, and D. Krause. 2008 IEEE / WIC / ACM International Conference on Web Intelligence,
WI 2008, 9-12 December 2008, Sydney, NSW, Australia, Main
Conference Proceedings, page 148-154. IEEE, (2008)
F. Abel, R. Kawase, and D. Krause. HT'10, Proceedings of the 21st ACM Conference on Hypertext
and Hypermedia, Toronto, Ontario, Canada, June 13-16, 2010, page 299-300. ACM, (June 2010)